An in-depth guide on implementing Highcharts.Tooltip functionality in a TypeScript environment

Currently, I am trying to implement a tooltip activation on click event in Highcharts by following an example from this URL: Highcharts - Show tooltip on points click instead mouseover. The challenge I'm facing is that I am using TypeScript and struggling to correctly translate the following line to TypeScript:

this.myTooltip = new Highcharts.Tooltip(this, this.options.tooltip);

The specific error message I encounter is: "Property Tooltip does not exist on type HighchartsStatic"

To address this issue, I attempted to add a new member to my controller as shown below:

public highchartTooltip: HighchartsTooltipOptions;

Followed by:

this.myTooltip = new self.highchartTooltip(this, this.options.tooltip);

However, this resulted in the error: "Cannot use 'new' with an expression whose type lacks a call or construct signature"... leaving me unsure how to create an object for initializing the tooltip according to the JavaScript example.

I also checked the definition of tooltip in this link: 

var Tooltip = Highcharts.Tooltip = function () {
     this.init.apply(this, arguments);
};

Tooltip.prototype = {...

Despite this, I couldn't figure out how to locate it in the TypeScript definition file.

You can find the complete JavaScript example here: http://jsfiddle.net/2swEQ/2/

I've submitted a ticket on GitHub for assistance: https://github.com/DefinitelyTyped/DefinitelyTyped/issues/9960

Is there any way to overcome this error? Maybe somehow ignore it and assume that the Highcharts.Tooltip object exists when the application is running?

javascripthighchartstypescript

Answer №1

This response may be coming in later, but it could still offer some value to future users.

In the (DefinitelyTyped) Highcharts .d.ts file, instead of being defined as a class, the tooltip is actually an interface, as mentioned in the official API documentation.

What this implies is that with TypeScript, you have the flexibility to achieve the following:

let tooltipOptions = <Highcharts.TooltipOptions> {
    // specify options here...
};

let chart = new Highcharts.Chart({
    tooltip: tooltipOptions
});

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